South Asian history: Local historians take part in a discussion titled “San Francisco’s Ghadar Party Heritage: 100 Years of Radical South Asian American History.” [7:30 p.m., Eric Quezada Center, 518 Valencia St., S.F.; www.shapingsf.org]

Lunch market: Off the Grid, which aims to bring new and old communities together via a mobile food experience, introduces a new lunch market in the South of Market area. [11 a.m. to 2 p.m., Fifth and Townsend streets, S.F.]